CN216161748U

CN216161748U - Grid line structure for step-by-step printing of solar cell

Info

Publication number: CN216161748U
Application number: CN202122119183.7U
Authority: CN
Inventors: 黄调调; 余建良; 李祥; 李健
Original assignee: Zhejiang Fortune Energy Co ltd
Current assignee: Zhejiang Fortune Energy Co ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2022-04-01
Anticipated expiration: 2031-09-03

Abstract

The utility model discloses a grid line structure for step-by-step printing of a solar cell, wherein the solar cell comprises a plurality of main grid lines and a plurality of auxiliary grid lines, the main grid lines are parallel to each other, the auxiliary grid lines are parallel to each other, the main grid lines are perpendicular to the auxiliary grid lines, the auxiliary grid lines comprise inner auxiliary grid lines and a plurality of outer auxiliary grid lines, the main grid lines and the inner auxiliary grid lines are sequentially connected, the joints of the main grid lines and the inner auxiliary grid lines are respectively set as connection points, two ends of the main grid lines are respectively connected with at least two end connection lines, the end connection lines are sequentially connected with the outer auxiliary grid lines, included angles are formed between adjacent end connection lines, bulges are arranged on part of the connection points, and two ends of the main grid lines are respectively provided with bulges. The grid line structure for step-by-step printing of the solar cell reduces the influence of deviation on the cell performance in the grid line distribution printing process and reduces the technical requirements on the printing process. Meanwhile, the connection strength of the grid lines, particularly the main grid lines, is improved, larger pulling force can be borne, and the product quality is more stable.

Description

Grid line structure for step-by-step printing of solar cell

Technical Field

The utility model belongs to the technical field of solar cells, and particularly relates to a grid line structure printed by solar cells step by step.

Background

Aiming at the market demands for higher and higher conversion efficiency and low cost of solar cells, the main grid and the auxiliary grid are designed on the two screen printing plates in a split mode through the step-by-step printing process, different silver pastes are used for the main grid and the auxiliary grid, the unit consumption of the silver pastes is reduced, and the manufacturing cost is greatly reduced. However, the main problems of such screen design are: 1. because the auxiliary grid lines are a plurality of parallel lines, the main grid line vertically and longitudinally penetrates through each auxiliary grid line, if the main grid line longitudinally deviates (namely, deviates in a direction perpendicular to the auxiliary grid lines) in the printing process, one end of the main grid line is disconnected with the outermost auxiliary grid line, and the current collection is directly influenced; 2. if the main grid line is transversely deviated (namely is deviated in a direction parallel to the auxiliary grid line) in the printing process, the test probe cannot be completely pressed on the main grid due to the deviation of the main grid line in the later test, and the test electrical property data is abnormal; 3. the main grid line and the auxiliary grid line printed step by step are not high in bonding strength, so that the tension of the main grid line is not high enough, the main grid line is easy to loosen from a solar cell, the electric property effect is poor, and the product quality problem is caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model adopts the technical scheme that: the solar cell comprises a plurality of main grid lines and a plurality of auxiliary grid lines, wherein the main grid lines are parallel to each other, the auxiliary grid lines are parallel to each other, the main grid lines are perpendicular to the auxiliary grid lines, the auxiliary grid lines comprise inner auxiliary grid lines and a plurality of outer auxiliary grid lines which are located on two sides of the inner auxiliary grid lines respectively, the main grid lines and the inner auxiliary grid lines are connected in sequence, the joints of the main grid lines and the inner auxiliary grid lines are set as connection points respectively, two ends of the main grid lines are connected with at least two end connection lines respectively, the end connection lines are connected with the outer auxiliary grid lines in sequence, included angles are formed between adjacent end connection lines, bulges are arranged on part of the connection points, and bulges are arranged at two ends of the main grid lines respectively.

Preferably, the protrusions are welded with the corresponding main grid lines and the corresponding inner auxiliary grid lines.

Preferably, in the above technical solution, the cross section of the protrusion is square.

Preferably, two ends of the protrusion are respectively connected with adjacent secondary grid lines through a gradient line, and the main grid line is connected with the middle of the protrusion.

Preferably, the tapered line includes a wide end and a narrow end, the wide end is connected to the protrusion, and the narrow end is connected to the corresponding sub-grid line.

Preferably, the number of the end connecting lines connected to one end of the main gate line is two.

Preferably, an included angle between two end connecting lines at one end of the main gate line is an acute angle.

Preferably, the two ends of the main gate line are respectively provided with a protrusion, and the two end connecting lines at the same end of the main gate line are respectively connected with two sides of the corresponding protrusion.

The utility model has the beneficial effects that: the grid line structure for step-by-step printing of the solar cell reduces the influence of deviation on the cell performance in the grid line distribution printing process and reduces the technical requirements on the printing process. Meanwhile, the connection strength of the grid lines, particularly the main grid lines, is improved, larger pulling force can be borne, and the product quality is more stable.

Drawings

FIG. 1 is a schematic view of a portion of the structure of the present invention;

fig. 2 is a schematic view of the structure of the projection.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-2, the solar cell comprises a plurality of main grid lines 2 and a plurality of auxiliary grid lines, the main grid lines 2 are parallel to each other, the auxiliary grid lines are parallel to each other, the main grid lines 2 are perpendicular to the auxiliary grid lines, the auxiliary grid lines comprise inner auxiliary grid lines 3 and a plurality of outer auxiliary grid lines 4 respectively located at two sides of all the inner auxiliary grid lines 3, the main grid lines 2 and the inner auxiliary grid lines 3 are sequentially connected, the joints of the main grid lines 2 and the inner auxiliary grid lines 3 are respectively set as connection points 5, two ends of the main grid lines 2 are respectively connected with at least two end connection lines 6, the end connection lines 6 are sequentially connected with the corresponding outer auxiliary grid lines 4, an included angle is formed between adjacent end connection lines 6, a protrusion 7 is arranged on part of the connection points 5, and two ends of the main grid lines 2 are respectively provided with a protrusion 7. By arranging the protrusions 7, the connection strength between the main grid lines 2 and the inner auxiliary grid lines 3 and the solar cell 1 is improved. The secondary grid line and the end connecting line 6 are printed firstly in the step-by-step printing process, and the secondary grid line and the end connecting line 6 can be designed to be smaller in width on the premise of ensuring the current transmission performance, so that the shielding area is reduced. After the secondary grid lines and the end connecting lines 6 are printed, the main grid lines 2 are printed, and then the bulges 7 are welded. Even if the main grid line 2 is offset during printing, the end part of the main grid line 2, the end connecting line 6 and the inner auxiliary grid line 3 are not connected in place, and the protrusions 7 can also repeatedly cover the unconnected part, so that offset within a certain range can be allowed to exist in distributed printing, and the quality of a battery is not affected. The material of the protrusion 7 is the same as that of the main grid line 2 and the auxiliary grid line.

Further, the protrusions 7 are welded to the corresponding main grid lines 2 and the inner auxiliary grid lines 3.

Further, the cross section of the protrusion 7 is square.

Furthermore, two ends of the protrusion 7 are respectively connected with the adjacent secondary grid lines 3 through a gradient line 8, and the main grid line 2 is connected with the middle part of the protrusion 7.

Furthermore, the gradual change line 8 comprises a wide end 9 and a narrow end 10, the wide end 9 is connected with the protrusion 7, and the narrow end 10 is connected with the corresponding inner auxiliary grid line 3. The gradual change line 8 further improves the connection strength of the inner auxiliary grid line 3 and the bulge 7, and the electron transmission efficiency is improved.

Further, the number of the end connecting lines 6 connected to one end of the main gate line 2 is two. The end connecting wires 6 are large in number, so that the current collection efficiency can be improved, the bonding strength of the grid lines and the battery is improved, but the photoelectric conversion efficiency is influenced due to the fact that the light receiving area of the battery is shielded due to the fact that the number of the end connecting wires is too large.

Further, an included angle between two end connecting lines 6 at one end of the main gate line 2 is an acute angle.

Furthermore, two end connecting lines 6 at the same end of the main gate line 2 are respectively connected to two sides of the corresponding protrusion 7.

It should be noted that technical features such as other structures of the solar cell related to the present patent application should be regarded as the prior art, and specific structures, operation principles, control manners and spatial arrangement manners of the technical features may be selected conventionally in the field, and should not be regarded as the points of the present patent, and the present patent is not further specifically described in detail.

Having described preferred embodiments of the present invention in detail, it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The grid line structure of solar cell step printing, solar cell is including a plurality of main grid lines and a plurality of vice grid line, and be parallel to each other between the main grid line, be parallel to each other between the vice grid line, main grid line perpendicular vice grid line, its characterized in that, vice grid line is including interior vice grid line and a plurality of outer vice grid line that is located interior vice grid line both sides respectively, connect gradually between main grid line and the interior vice grid line, establish respectively to the tie point main grid line and interior vice grid line's junction, and the both ends of main grid line are connected with at least two end connecting wires respectively, and the end connecting wire is connected with outer vice grid line in proper order, forms the contained angle between the adjacent end connecting wire, and part be equipped with the arch on the tie point, the both ends of main grid line have the arch respectively.

2. The solar cell step-printed grid line structure of claim 1, wherein the protrusions are soldered to the respective main grid lines and inner minor grid lines.

3. The solar cell step-by-step printed grid line structure of claim 2, wherein the projections have a square cross-section.

4. The step-by-step printed grid line structure of claim 3, wherein two ends of the protrusion are respectively connected with adjacent secondary grid lines through a gradient line, and the main grid line is connected with the middle part of the protrusion.

5. The solar cell step-by-step printed grid line structure of claim 4, wherein the tapered line comprises a wide end and a narrow end, the wide end is connected with the protrusion, and the narrow end is connected with the corresponding secondary grid line.

6. The solar cell step-by-step printed gate line structure of claim 5, wherein two end connection lines are connected to one end of the main gate line.

7. The solar cell step-by-step printed gate line structure of claim 6, wherein an angle between two end connection lines at one end of the main gate line is an acute angle.

8. The solar cell step-by-step printed gate line structure of claim 7, wherein two end connection lines at the same end of the main gate line are connected to both sides of the corresponding protrusions, respectively.